In influence the stress plate is actually a spring loaded clamp – designed to clamp down to the clutch plate when the clutch is engaged. When the clutch is engaged (clutch pedal up) the motor and gearbox are related, and when the clutch is disengaged (clutch pedal down) the motor https://clutchkereta99752.tinyblogging.com/clutch-kereta-fundamentals-explained-76687347